<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<script>
var disc = prompt("请输入正方形的行数：")
// alert("正方形"+disc+"行")
if (disc>10){
    disc=10
}

for (i=0;i<disc;i++){
    for (j=0;j<disc;j++){
    document.write("*")
    }
    document.write("<br />")
}
</script>


</body>
</html>